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    <title>Hello World | iBook</title><meta name="description" content="my know book">
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    <div id="app"><!--[--><div class="theme-container"><!--[--><header class="navbar"><div class="toggle-sidebar-button" title="toggle sidebar" aria-expanded="false" role="button" tabindex="0"><div class="icon" aria-hidden="true"><span></span><span></span><span></span></div></div><span><a aria-current="page" href="/" class="router-link-active router-link-exact-active"><!----><span class="site-name">iBook</span></a></span><div class="navbar-items-wrapper" style=""><!--[--><!--]--><!----><!--[--><!--]--><button class="toggle-color-mode-button" title="toggle color mode"><svg style="" class="icon" focusable="false" viewBox="0 0 32 32"><path d="M16 12.005a4 4 0 1 1-4 4a4.005 4.005 0 0 1 4-4m0-2a6 6 0 1 0 6 6a6 6 0 0 0-6-6z" fill="currentColor"></path><path d="M5.394 6.813l1.414-1.415l3.506 3.506L8.9 10.318z" fill="currentColor"></path><path d="M2 15.005h5v2H2z" fill="currentColor"></path><path d="M5.394 25.197L8.9 21.691l1.414 1.415l-3.506 3.505z" fill="currentColor"></path><path d="M15 25.005h2v5h-2z" fill="currentColor"></path><path d="M21.687 23.106l1.414-1.415l3.506 3.506l-1.414 1.414z" fill="currentColor"></path><path d="M25 15.005h5v2h-5z" fill="currentColor"></path><path d="M21.687 8.904l3.506-3.506l1.414 1.415l-3.506 3.505z" fill="currentColor"></path><path d="M15 2.005h2v5h-2z" fill="currentColor"></path></svg><svg style="display:none;" class="icon" focusable="false" viewBox="0 0 32 32"><path d="M13.502 5.414a15.075 15.075 0 0 0 11.594 18.194a11.113 11.113 0 0 1-7.975 3.39c-.138 0-.278.005-.418 0a11.094 11.094 0 0 1-3.2-21.584M14.98 3a1.002 1.002 0 0 0-.175.016a13.096 13.096 0 0 0 1.825 25.981c.164.006.328 0 .49 0a13.072 13.072 0 0 0 10.703-5.555a1.01 1.01 0 0 0-.783-1.565A13.08 13.08 0 0 1 15.89 4.38A1.015 1.015 0 0 0 14.98 3z" fill="currentColor"></path></svg></button><form class="search-box" role="search"><input type="search" placeholder="Search" autocomplete="off" spellcheck="false" value><!----></form></div></header><!--]--><div class="sidebar-mask"></div><!--[--><aside class="sidebar"><!----><!--[--><!--]--><ul class="sidebar-items"><!--[--><li><a aria-current="page" href="/" class="router-link-active router-link-exact-active sidebar-item sidebar-heading active" aria-label="Hello World"><!--[--><!--]--> Hello World <!--[--><!--]--></a><!----></li><li><a href="/mqtt.html" class="sidebar-item sidebar-heading" aria-label="MQTT &amp; EMQX"><!--[--><!--]--> MQTT &amp; EMQX <!--[--><!--]--></a><!----></li><li><a href="/acme.html" class="sidebar-item sidebar-heading" aria-label="ACME"><!--[--><!--]--> ACME <!--[--><!--]--></a><!----></li><li><a href="/nodejs.html" class="sidebar-item sidebar-heading" aria-label="Node.js"><!--[--><!--]--> Node.js <!--[--><!--]--></a><!----></li><li><a href="/ffmpeg.html" class="sidebar-item sidebar-heading" aria-label="FFmpeg Usage"><!--[--><!--]--> FFmpeg Usage <!--[--><!--]--></a><!----></li><li><p tabindex="0" class="sidebar-item sidebar-heading"> <!----></p><!----></li><!--]--></ul><!--[--><!--]--></aside><!--]--><!--[--><main class="page"><!--[--><!--]--><div class="theme-default-content"><!--[--><!--]--><div><h1 id="hello-world" tabindex="-1"><a class="header-anchor" href="#hello-world" aria-hidden="true">#</a> Hello World</h1><p>&#39;# Hello World.&#39;</p><div class="custom-container tip"><p class="custom-container-title">TIP</p><p>这是一个提示</p></div><div class="custom-container warning"><p class="custom-container-title">WARNING</p><p>这是一个警告</p></div><div class="custom-container danger"><p class="custom-container-title">DANGER</p><p>这是一个危险警告</p></div><details class="custom-container details"><p>这是一个详情块，在 IE / Edge 中不生效</p></details><div class="custom-container danger"><p class="custom-container-title">STOP</p><p>危险区域，禁止通行</p></div><div class="language-javascript line-numbers-mode" data-ext="js"><pre class="language-javascript"><code>console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">&#39;你好，World！&#39;</span><span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><details class="custom-container details"><summary>点击查看代码</summary><div class="language-javascript line-numbers-mode" data-ext="js"><pre class="language-javascript"><code>console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">&#39;你好，World！&#39;</span><span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div></details><div class="language-csharp line-numbers-mode" data-ext="cs"><pre class="language-csharp"><code>Console<span class="token punctuation">.</span><span class="token function">WriteLine</span><span class="token punctuation">(</span><span class="token string">&quot;你好，World！&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div></div><!--[--><!--]--></div><footer class="page-meta"><!----><!----><!----></footer><nav class="page-nav"><p class="inner"><!----><span class="next"><a href="/mqtt.html" class="" aria-label="MQTT &amp; EMQX"><!--[--><!--]--> MQTT &amp; EMQX <!--[--><!--]--></a></span></p></nav><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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